Is it normal i think the big bang theory is inaccurate.
The big bang theory is based upon evidence that the universe is expanding.
However I do not think this proves it all. Even if there was a big bang, it expands and collapses. Either way though it is cyclic.
So how is it expanding and imploding at the same time?
Within deep space it is likely that our laws of space and time are quite different than here.
There is no beginning or end. Time is not linier the way we think it is. We simply perceive it as linier because that is what our simple minds can perceive and comprehend.
Not only that but it seems that the universe expands into itself. A simple way to think of it is like a pac-man game, only way more complex and with more dimensions than most people aknowledge.